Murata MHR Series Replacement — All 22 SIP Sizes Cross Reference

MHR to HVC flat resistor cross reference

Murata series	Body L × H	Pitch	Power	Voltage single / molded	Resistance	HVC flat model	Supply
MHR0307SA series	7.6 × 5 mm	5.08 mm	0.3 W	2 / 3 kV	1–1000 MΩ	HVRGHP5.8	CNC cut to size
MHR0309SA series	10.1 × 5 mm	7.62 mm	0.5 W	3.5 / 5 kV	1–1000 MΩ	HVRGHP5.10	CNC cut to size
MHR0312SA series	12.6 × 5 mm	10.16 mm	0.6 W	5 / 7.5 kV	1–1000 MΩ	HVRGHP5.13	CNC cut to size
MHR0314SA series	15.1 × 5 mm	12.7 mm	0.7 W	6 / 10 kV	1–1000 MΩ	HVRGHP5.15	CNC cut to size
MHR0317SA series	17.6 × 5 mm	15.24 mm	0.8 W	7 / 12 kV	1–1000 MΩ	HVRGHP5.18	CNC cut to size
MHR0319SA series	20.2 × 5 mm	17.78 mm	1 W	8 / 14 kV	1–2000 MΩ	HVRGHP5.20	Catalogue outline
MHR0409SA series	10.1 × 6.5 mm	7.62 mm	0.6 W	3.5 / 10 kV	1–1000 MΩ	HVRGHP6.10	CNC cut to size
MHR0412SA series	12.6 × 6.5 mm	10.16 mm	0.8 W	5 / 10 kV	1–1000 MΩ	HVRGHP6.13	Catalogue outline
MHR0414SA series	15.1 × 6.5 mm	12.7 mm	1 W	6 / 10 kV	1–1000 MΩ	HVRGHP6.15	CNC cut to size
MHR0417SA series	17.6 × 6.5 mm	15.24 mm	1.1 W	7 / 12 kV	1–2000 MΩ	HVRGHP6.18	CNC cut to size
MHR0419SA series	20.2 × 6.5 mm	17.78 mm	1.2 W	8 / 14 kV	1–2000 MΩ	HVRGHP6.20	CNC cut to size
MHR0422SA series	22.7 × 6.5 mm	20.32 mm	1.3 W	9 / 16 kV	1–2000 MΩ	HVRGHP6.23	CNC cut to size
MHR0424SA series	25.3 × 6.5 mm	22.86 mm	1.4 W	10 / 18 kV	1–2000 MΩ	HVRGHP6.25	Catalogue outline
MHR0429SA series	30.5 × 6.5 mm	27.94 mm	1.7 W	12 / 22 kV	1–2000 MΩ	HVRGHP6.30	Catalogue outline
MHR0609SA series	10.1 × 9 mm	7.62 mm	0.8 W	3.5 / 10 kV	1–1000 MΩ	HVRGHP9.10	CNC cut to size
MHR0612SA series	12.6 × 9 mm	10.16 mm	1 W	5 / 10 kV	1–2000 MΩ	HVRGHP9.13	CNC cut to size
MHR0614SA series	15.1 × 9 mm	12.7 mm	1.2 W	6 / 12 kV	1–2000 MΩ	HVRGHP9.15	Catalogue outline
MHR0617SA series	17.6 × 9 mm	15.24 mm	1.3 W	7 / 14 kV	1–2000 MΩ	HVRGHP9.18	CNC cut to size
MHR0619SA series	20.2 × 9 mm	17.78 mm	1.4 W	8 / 16 kV	1–2000 MΩ	HVRGHP9.20	CNC cut to size
MHR0622SA series	22.7 × 9 mm	20.32 mm	1.5 W	9 / 18 kV	1–10000 MΩ	HVRGHP9.23	CNC cut to size
MHR0624SA series	25.3 × 9 mm	22.86 mm	1.6 W	10 / 20 kV	1–1000 MΩ	HVRGHP9.25	Catalogue outline
MHR0844SA series	46 × 10 mm	40.64 mm	2.5 W	20 / 35 kV	1–2000 MΩ	HVRGHP10.46	CNC cut to size

6 of the 22 sizes sit on a standard HVC outline; the remaining 16 are cut to the Murata drawing. Model codes follow the HVC flat rule HVRGHP{height}.{length}, in millimetres. Murata figures are the catalogue values; HVC ratings are continuous values in air.

Capability envelope: MHR against the other thick film lines

The MHR line is a compact SIP part, and its envelope reflects that. Set against the other thick film families a designer will shortlist for the same socket, it is the smallest on every axis.

Capability	Murata MHR	HVC HVRGHP	Ohmite Slim-Mox / Ultra-Mox	EBG flat HV
Rated power	0.3 - 2.5 W	0.25 - 10 W	0.25 - 9 W	up to 7.5 W
Working voltage	2 - 20 kV single 3 - 35 kV molded	1.5 - 67 kV	1.5 - 25 kV (Slim-Mox) 10 - 30 kV (plate)	up to 35 kV in air
Resistance	1 - 2000 MΩ	200 Ω - 1 TΩ	100 Ω - 5 GΩ 10 TΩ on Ultra-Mox	200 Ω - 2 GΩ
TCR	±250 ppm/°C max	down to ±15 ppm/°C	25 - 100 ppm/°C	±80 ppm/°C
Tolerance	±0.5% to ±20%	±0.5% and up	±0.5% and up	±0.5% to ±10%
Operating temperature	-40 to +125 °C	-40 to +175 °C	-55 to +155 °C	-55 to +175 °C
Package	SIP plate, blue coat	Plate, radial or SIP lead, cut to size	Planar radial	Planar, coated

Murata figures from the MHR series datasheet R02E (TCR limit ±250 ppm/°C, Table 1). HVC figures from the HVRGHP catalogue. Ohmite figures from the Slim-Mox, Slim-Mox HT and Ultra-Mox datasheets. EBG figures from the Miba EBG flat high voltage resistor range, which states up to 35 kV in air and ±80 ppm/°C.

Three consequences follow, and they are the reason a designer arrives at this page. The MHR line stops at 2.5 W, so any divider that dissipates more has to leave the SIP footprint. It stops at 20 kV single use, so anything above that either needs the part potted or needs a different body. And at ±250 ppm/°C it is the loosest temperature coefficient in the table against a 15 ppm/°C floor, which is the figure that decides whether a divider holds its ratio in a warm cabinet.

So funktioniert der Schnitt

The MHR body is a resistor element printed on a 96 % alumina substrate, coated and fitted with a SIP lead frame. HVC builds the same construction: ruthenium oxide on alumina, laser trimmed, then CNC cut to the substrate length and height on the Murata drawing. The lead frame is formed to the printed pitch, so the part seats where the original seated and no PCB change is needed.

Because the cut is a machining step rather than a new tooling step, sizes that Murata builds in low volume, and resistance values outside the nine catalogue steps, are available without a tooling charge. That is the usual reason a buyer arrives with an MHR number rather than an order history.

Reading the two voltage columns

Every MHR size carries two figures: single use and molded use. The gap between them is the potting, not the resistor - the same substrate carries the same element. If a substitute is quoted at the molded figure without the molding, it is not the same part. State the medium (air, oil, SF6) and the duty in the enquiry.

Which sizes are worth starting from

The 5 mm and 6.5 mm substrates cover the office-machine, air purifier and static-elimination volume; the 9 mm and 10 mm substrates carry the higher wattage divider work. The power ceiling of the line is MHR0844SA at 2.5 W and 20 kV single use, so anything above that moves to the HVC GHP or PFS families rather than to a cut MHR outline.

MHR replacement FAQ

Can HVC match every MHR substrate size?

Yes. The MHR body is a thick film plate on an alumina substrate, and HVC cuts the plate on a CNC to the printed length and height, so all 22 substrate sizes in the Murata catalogue can be supplied 1:1. Six of them already sit on standard HVC outlines; the other sixteen are cut to the drawing.

Does the replacement need a different PCB layout?

No. Body length, body height and lead pitch are held to the Murata drawing, and the lead is formed to the same pitch, so the part drops into the existing footprint.

Can it be supplied with the blue coating?

Yes. The coating colour and the coating type are specified in the RFQ. Murata uses a thin blue silicone coat on the MHR line, and HVC can match it.

What about the single use and molded use voltage figures?

Murata quotes two figures because the molded version is potted. The substrate and the resistor element are the same. HVC quotes a continuous working voltage in air and reviews an oil, SF6 or potted assembly separately, so state the medium and the duty.